FFmpeg not extracting part of the video

I used FFmpeg to extract portion (5 seconds) of a video like this:

ffmpeg -ss 00:30:00 -t 00:00:05 -i original.avi cut1.avi

and also like this:

ffmpeg -ss 1800 -t 5 -i original.avi cut1.avi

But what FFmpeg did was create a file starting at 00:30:00 and included the rest of the file instead of just 5 seconds. So instead of having a 5 second video clip, I now have the whole file except the first 30 minutes.

What went wrong?

I tried this with mencoder as well -- same result.

EDIT 1

Strangely, this worked on OS X....

EDIT 2

After rebooting Ubuntu, I found that FFmpeg worked fine. What process was turned off that did this though?

Solution 1:

have you tried with this

ffmpeg -ss 00:00:30.0 -t 00:00:10.0 -i input.wmv -acodec copy -vcodec copy -async 1 output.wmv

for more information , look at this https://superuser.com/questions/138331/using-ffmpeg-to-cut-up-video